silverlight - 我需要创建自定义控件吗？

Question

我想调整按钮的角半径。我可以通过创建一个单独的样式资源并在模板中设置边框的圆角半径来做到这一点。但是，我必须为每个变体创建一个单独的样式。

我想要的是一个实际的 CornerRadius 属性，我可以为每个按钮设置它，而不必在每次我想要不同的角半径时都创建另一种样式。

创建自定义控件是我唯一的解决方案吗？

Answer 1

经过一番尝试后，我得出结论，最简单的方法是绑定(bind)到 ConerRadius 类型的附加属性。

在模板中，您可以像这样绑定(bind)角半径:

<Border x:Name="Background" CornerRadius="{TemplateBinding Corner.Radii}" 

你可以这样使用它:

<Button Corner.Radii="10"

甚至像这样:

<Button Corner.Radii="2, 10, 10, 2"

例子:

完整代码如下:

附加属性类:

public static class Corner
{
    public static readonly DependencyProperty RadiiProperty = DependencyProperty.RegisterAttached(
      "Radii",
      typeof(CornerRadius),
      typeof(UIElement), null);

    public static void SetRadii(UIElement element, CornerRadius value)
    {
        element.SetValue(RadiiProperty, value);
    }

    public static CornerRadius GetRadii(UIElement element)
    {
        return (CornerRadius)element.GetValue(RadiiProperty);
    }
}

使用它的示例页面:

注意:此示例中包含完整的内联按钮模板

<UserControl x:Class="CornerBehaviorTest.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:CornerBehaviorTest="clr-namespace:CornerBehaviorTest" mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.Resources>
        <Style TargetType="Button">
            <Setter Property="Background" Value="AliceBlue"/>
            <Setter Property="Foreground" Value="Red"/>
            <Setter Property="Padding" Value="3"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="BorderBrush">
                <Setter.Value>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="#FFA3AEB9" Offset="0"/>
                        <GradientStop Color="#FF8399A9" Offset="0.375"/>
                        <GradientStop Color="#FF718597" Offset="0.375"/>
                        <GradientStop Color="#FF617584" Offset="1"/>
                    </LinearGradientBrush>
                </Setter.Value>
            </Setter>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Grid>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal"/>
                                    <VisualState x:Name="MouseOver">
                                        <Storyboard>
                                            <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundAnimation" Storyboard.TargetProperty="Opacity" To="1"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#F2FFFFFF"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#CCFFFFFF"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#7FFFFFFF"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed">
                                        <Storyboard>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="Background" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" To="#FF6DBDD1"/>
                                            <DoubleAnimation Duration="0" Storyboard.TargetName="BackgroundAnimation" Storyboard.TargetProperty="Opacity" To="1"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)" To="#D8FFFFFF"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)" To="#C6FFFFFF"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)" To="#8CFFFFFF"/>
                                            <ColorAnimation Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Rectangle.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)" To="#3FFFFFFF"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <DoubleAnimation Duration="0" Storyboard.TargetName="DisabledVisualElement" Storyboard.TargetProperty="Opacity" To=".55"/>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="FocusStates">
                                    <VisualState x:Name="Focused">
                                        <Storyboard>
                                            <DoubleAnimation Duration="0" Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Opacity" To="1"/>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Unfocused" />
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <Border x:Name="Background" CornerRadius="{TemplateBinding CornerBehaviorTest:Corner.Radii}" Background="White" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}">
                                <Grid Background="{TemplateBinding Background}"  Margin="1">
                                    <Border Opacity="0"  x:Name="BackgroundAnimation" Background="#FF448DCA" />
                                    <Rectangle x:Name="BackgroundGradient" >
                                        <Rectangle.Fill>
                                            <LinearGradientBrush StartPoint=".7,0" EndPoint=".7,1">
                                                <GradientStop Color="#FFFFFFFF" Offset="0" />
                                                <GradientStop Color="#F9FFFFFF" Offset="0.375" />
                                                <GradientStop Color="#E5FFFFFF" Offset="0.625" />
                                                <GradientStop Color="#C6FFFFFF" Offset="1" />
                                            </LinearGradientBrush>
                                        </Rectangle.Fill>
                                    </Rectangle>
                                </Grid>
                            </Border>
                            <ContentPresenter
                              x:Name="contentPresenter"
                              Content="{TemplateBinding Content}"
                              ContentTemplate="{TemplateBinding ContentTemplate}"
                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                              HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                              Margin="{TemplateBinding Padding}"/>
                            <Rectangle x:Name="DisabledVisualElement" RadiusX="3" RadiusY="3" Fill="#FFFFFFFF" Opacity="0" IsHitTestVisible="false" />
                            <Rectangle x:Name="FocusVisualElement" RadiusX="2" RadiusY="2" Margin="1" Stroke="#FF6DBDD1" StrokeThickness="1" Opacity="0" IsHitTestVisible="false" />
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Resources>
        <Grid x:Name="LayoutRoot" Background="White">
        <Button CornerBehaviorTest:Corner.Radii="10,5,5,5" Content="Button" Height="40" HorizontalAlignment="Left" Margin="130,22,0,0" Name="button1" VerticalAlignment="Top" Width="73" />
    </Grid>
</UserControl>

旧答案

您有多种选择:

• 使用应用程序资源创建您想要的各种半径类型并使用 StaticResource Binding(Expression Blend 只允许您在 GUI 中执行此操作，这很好，但您可以手动执行)
• 您可以创建附加行为并使用一个 Radius 属性来设置所有 4 个角。
• 创建附加的依赖属性(将模板绑定(bind)到新的 Radius 属性)
• 您可以按照您的建议创建自定义控件。